Ni-Cd AA4500mAh 7.2V Battery In the digital age, our devices are often hungry for power. And while we are accustomed to charging our devices at any time, this doesn't always happen. The Ni-Cd AA4500mAh 7.2V Battery is a battery that can be charged in advance and used when needed. It can also be charged in sequence for an extended battery life. The Ni-Cd AA4500mAh 7.2V Battery is available in packages of four, eight, and twelve.